PYTHON-3088 [v3.13] Update load balancer tests to support dedicated load balancer port (mongodb#870)

(cherry picked from commit 341d489)

Author: juliusgeo

.evergreen/config.yml

@@ -1937,6 +1937,10 @@ axes:
         display_name: "MongoDB latest"
         variables:
           VERSION: "latest"
+      - id: "rapid"
+        display_name: "MongoDB rapid"
+        variables:
+          VERSION: "rapid"
 
   # Choice of Python runtime version
   - id: python-version
@@ -2636,7 +2640,7 @@ buildvariants:
 - matrix_name: "load-balancer"
   matrix_spec:
     platform: ubuntu-18.04
-    mongodb-version: ["5.0", "latest"]
+    mongodb-version: ["rapid", "latest"]
     auth-ssl: "*"
     python-version: "*"
     loadbalancer: "*"

pymongo/pool.py

@@ -630,8 +630,6 @@ def _hello(self, cluster_time, topology_version, heartbeat_frequency):
             auth_ctx = None
 
         doc = self.command("admin", cmd, publish_events=False, exhaust_allowed=awaitable)
-        if not self.opts.load_balanced:
-            doc.pop("serviceId", None)
         hello = Hello(doc, awaitable=awaitable)
         self.is_writable = hello.is_writable
         self.max_wire_version = hello.max_wire_version
@@ -676,9 +674,6 @@ def _next_reply(self):
         unpacked_docs = reply.unpack_response()
         response_doc = unpacked_docs[0]
         helpers._check_command_response(response_doc, self.max_wire_version)
-        # Remove after PYTHON-2712.
-        if not self.opts.load_balanced:
-            response_doc.pop("serviceId", None)
         return response_doc
 
     def command(